Leading-in wire



' UNITED STATES PATENT OFFICE,

WILLIAM G. HOUSKEEPER, OF NEW YORK, N. Y., ASSIGNOR T0 WESTERN EIiECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

LEADING-IN WIRE.

No Drawing.

To all whom it may concern.

Be it known that I, WILLIAM G. HoUsnnnrnn, a citizen of the United States, re-

' bending or twisting incident to the reeling of the wire.

In making use of 1IOI1, iron nlckel alloy and copper wires for conducting current through the glass walls of evacuated glass articles, it has been found desirable to employ a fluxing agent in order to secure a satisfactory tight seal. While the fluxing medium may be applied just prior to the insertion of the wire in the glass, it is highly desirable that a continuous film of the flux be so attached to the wire as to allow the latter to be reeled, subsequent to the treatment, without danger of disrupting ,the superimposed coating.

I A suitable material which can be removed easily by the aid of heat is to be preferred in binding the flux to the wire.- Organic compounds which contain no metallic radical are admirably adapted for this purpose.

Some of the organic substances which are suitable for use contain water either as water of combination or constitution, which, however, will not be detrimental to the subsequent use and treatment to which the coating is subjected.

Such a film or coating is produced, according to this invention, by adding to the flux a suitable colloid-forming material which is capable of forming a hard, continuous layer on a metallic surface. As a fluxmedium a borate, for example borax Na l3 O,.10I-I,O

is preferably used. To this in concentrated solution is added a predetermined amount of a suitable colloid-forming material, as, for example, gelatin. The wire to be covwith this composition is first freed from any Specification of Letters Patent.

surface grease or dirt and then passed slowly through the bath. As it comes out of the latter the coating is dried in a current of warm, dry air. This process produces a tough, elastic coating, and consequently the wire may be reeled and kept until needed; and may be shipped and handled without danger of injury to the coating. During the sealing-in process when the heatapplied reaches a certain temperature, the organic material is decomposed, the volatile matter being volatized, and the carbon uniting with the oxygen of the warm air to form the gaseous oxids of carbon.

While gelatin has been mentioned as the colloid-forming material which is preferred for use in the process, it is to be understood that any colloid-forming material having the properties of gelatin, when used in the manner described above, and any borate having the fluxing properties of 'borax may be employed.

.It may sometimes be desirable to add glyc erin to the bath in order to prevent the borax from crystallizing out. tion would be required where the bath be- COIIIGS'QVGI' concentrated due to the loss of water. The presence of glycerin in thebath will, moreover, have a beneficial effect if the wire is to be stored a considerable length of time after treatment.

What is claimed is: y

1. The method of producing a superimposed flux coating on a leading-in wire which consists in drawing the wire through a bath containing a borate and a colloidforming material and then subjecting it to a current of warm, dry air.

2. A leading-in wire covered with a composition containing a borate, and a carbona- ,ceous binder, with or wlthout H 0.

3. A leading-in wire covered with a composition containing a borate and a'colloidforming material.

4. A leading-in wire covered with a composition containing glycerin, a borate and a colloid-forming material.

5. A leading-1n wire covered wlth a composition containing a borate and gelatin.

6. A leading-in wire covered with at (301111 position containing borax and gelatin.

In witness whereof, I hereunto subscrlbe my name this 20th day of November,- A. D.

, WILLIAM G. HOUSKEEPER.

Patented Nov. 2, 1920. Application filed November 25, 1919. Serial No. 340,669.

This addi- 80 

